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Cyclic flexural fatigue resistance of NiTi Controlled Memory and Blue Technology instruments after torsional preloading.
Modesto, Túlio César; Acosta, Eufemia Carolina Peláez; Resende, Pedro Damas; Pereira, Érika Sales Joviano; Peixoto, Isabella Faria da Cunha; Buono, Vicente Tadeu Lopes; Viana, Ana Cecília Diniz.
Afiliación
  • Modesto TC; Departmento de Odontologia Restauradora, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
  • Acosta ECP; Departmento de Odontologia Restauradora, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
  • Resende PD; Departmento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
  • Pereira ÉSJ; Departamento de Clínica Odontológica, Faculdade de Odontologia, Universidade Federal da Bahia, Salvador, BA, Brasil.
  • Peixoto IFDC; Departmento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
  • Buono VTL; Departmento de Engenharia Metalúrgica e de Materiais, Faculdade de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
  • Viana ACD; Departmento de Odontologia Restauradora, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
J Appl Oral Sci ; 26: e20180144, 2018.
Article en En | MEDLINE | ID: mdl-30133671
Objective The aim of this study was to evaluate the influence of torsional preloading on the cyclic flexural fatigue resistance of thermally treated NiTi instruments. Material and Methods Ten new instruments New Hyflex CM (HF 30.06; Coltene/Whaladent Inc.), Typhoon CM (TYP 30.06; Clinician's Choice Dental Products) and Vortex Blue (VB 30.06; Dentsply Tulsa Dental) were chosen, based on geometry and specific characteristics of the manufacturing process. The new instruments of each system were tested in a bench device to determine their fatigue resistance through mean value of number of cycles to failure (Nf) (Control Group - CG). Another group of 10 new HF, TYP and VB instruments were submitted to 20 cycles of torsional straining between 0° and 180° (Experimental Group - EG) and then submitted to fatigue until rupture under the same conditions of the CG. Tested instruments were examined by scanning electron microscopy (SEM). Data were analyzed using one-way analysis of variance and post hoc Tukey's test (α=.05). Results Higher fatigue resistance was accomplished by HF instruments, followed by VB and TYP (p<0.05). During the torsional preloading, the lowest mean torque value was observed for TYP instruments (p<0.05). The torsional preload caused a significant reduction in the Nf values (p<0.05) of about 20%, 39% and 45% for instruments HF, VB and TYP, respectively. Longitudinal cracks, generated during the torsional preloading, were present in VB files, but were not observed in the CM instruments (HF and TYP). Conclusions In conclusion, the flexural fatigue resistance of thermally treated instruments is diminished after cyclic torsional loading.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Titanio / Instrumentos Dentales / Diseño de Equipo / Falla de Equipo / Torsión Mecánica / Níquel Tipo de estudio: Evaluation_studies Idioma: En Revista: J Appl Oral Sci Asunto de la revista: ODONTOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Brasil

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Titanio / Instrumentos Dentales / Diseño de Equipo / Falla de Equipo / Torsión Mecánica / Níquel Tipo de estudio: Evaluation_studies Idioma: En Revista: J Appl Oral Sci Asunto de la revista: ODONTOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Brasil
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